[Python] Adding vertical lines to histogram plot

I have the following code to plot a histogram in Python:

fig.add_trace(go.Histogram(x = df["error"], showlegend = False))

This results into a histogram similar to:



Now I want to add 2 vertical lines to the plot at x = target and x = -target, to create something similar like:



I currently have the following code:

fig.add_trace(go.Scatter(x=[target, target], y=[0, ymax],
mode='lines', name='target', line=dict(color='grey', dash='dash'),
legendgroup='target', showlegend=True))
fig.add_trace(go.Scatter(x=[-target, -target], y=[0, ymax],
mode='lines', name='target', line=dict(color='grey', dash='dash'),
legendgroup='target', showlegend=False))


However, I am not sure how I can retrieve the required ymax value from the histogram plot.

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